Loop Suppression of Dirac Neutrino Mass in the Neutrinophilic Two Higgs Doublet Model
Abstract
We extend the scalar sector of the neutrinophilic two Higgs doublet model, where small masses of Dirac neutrinos are obtained via a small vacuum expectation value vnu of the neutrinophilic SU(2)L-doublet scalar field which has a Yukawa interaction with only right-handed neutrinos. A global U(1)X symmetry is used for the neutrinophilic nature of the second SU(2)L-doublet scalar field and also for eliminating Majorana mass terms of neutrinos. By virtue of an appropriate assignment of the U(1)X-charges to new particles, our model has an unbroken Z2 symmetry, under which the lightest Z2-odd scalar boson can be a dark matter candidate. In our model, vnu is generated by the one-loop diagram to which Z2-odd particles contribute. We briefly discuss a possible signature of our model at the LHC.
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